chore: delete .github/workflows/generate-docs.yaml (#9506)

This workflow has been disabled for a long time and caused confusion the
other day with Melinda while trying to debug some documentation issue.

Now documentation is published by vercel

.github/workflows/generate-docs.yaml

@@ -1,35 +0,0 @@
-name: Generate documentation
-
-on:
-  push:
-    branches:
-      - main
-    paths:
-      - website/**
-
-  workflow_dispatch:
-
-  schedule:
-    - cron: '0 0 * * *'
-
-jobs:
-  build:
-    if: false # disable this job
-    runs-on: ubuntu-latest
-    steps:
-      - uses: actions/checkout@v4
-      - name: setup git config
-        run: |
-          git config --global user.name "${GH_NAME}"
-          git config --global user.email "${GH_EMAIL}"
-          echo "machine github.com login ${GH_NAME} password ${GH_TOKEN}" > ~/.netrc
-          # Stage the file, commit and push
-          cd website && yarn && GIT_USER="ivarconr" yarn deploy
-        env:
-          GH_NAME: 'ivarconr'
-          GH_EMAIL: 'ivarconr@gmail.com'
-          GH_TOKEN: ${{ secrets.GH_TOKEN }}
-          DEPLOYMENT_BRANCH: 'main'
-          UNLEASH_FEEDBACK_TARGET_URL: ${{ secrets.DOCS_FEEDBACK_TARGET_URL }}
-          UNLEASH_PROXY_CLIENT_KEY: ${{ secrets.UNLEASH_PROXY_CLIENT_KEY_PRODUCTION }}
-          UNLEASH_PROXY_URL: ${{ secrets.UNLEASH_PROXY_URL_PRODUCTION }}